0 Hello A Blinkin'02br 02br 00The preposition "by" demands an objective case so it should be "Isn't all this done 01b00by him02b00 himelf?"02br 02br 00paco 0-
0 The fixed expression you're talking about would occur with the active voice.02br 02br 01i00He did it by himself.02i02br 02br 00 The 01i00by02i00 in the example sentence is a 'different' 01i00by02i00, if you will. It is the 01i00by02i00 that introduces the agent of the a